以锐钛型TiO2为载体,V2O5为主要活性成分,同时负载WO3和MoO3作为活性助剂,制备了四元催化剂V2O5 WO3-MoO3/TiO2,并对该催化剂的脱硝活性、催化选择性及微观表征进行了研究.结果表明,该四元催化剂脱硝性能优于相同负载量下单一负载W或Mo的三元催化剂,W可以提高催化剂高温(＞400C)活性,同时抑制Mo在高温区间导致的副反应发生,Mo可以提高低温(＜300C)活性,弥补W在低温区间的活性不足.该四元催化剂最大活性99％,温度窗口(脱硝活性＞80％)为280～420℃,在180～380℃范围内SO2氧化率为零,在0～1000C范围内存在3个失重峰,100～130℃结晶水蒸发,230～270℃有机添加剂分解,500～530 ℃无机盐分解,微观镜像表明该催化剂颗粒均匀致密,粒径大小一致,没有出现团聚现象,具有完整的微孔结构.
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